
import {
  Blob,
  btoa,
  createImageBitmap,
  CSSStyleDeclaration,
  performance,
  document,
  DOMParser,
  EventTarget,
  fetch,
  Headers,
  HTMLCanvasElement,
Image,
  HTMLImageElement,
  ImageBitmap,
  location,
  navigator,
  Request,
  requestAnimationFrame,
  cancelAnimationFrame,
  Response,
  URL,
  window,
  self,
  WebAssembly,
  Worker,
  XMLHttpRequest,
ImageData,
TextDecoder,
  core
  } from 'dhtml-weixin';
import {
EventDispatcher,
MOUSE,
Quaternion,
Vector2,
Vector3
} from '../../../three/Three';

const _changeEvent = { type: 'change' };
const _startEvent = { type: 'start' };
const _endEvent = { type: 'end' };

class TrackballControls extends EventDispatcher {

constructor( object, domElement ) {

  super();

  const scope = this;
  const STATE = { NONE: - 1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM_PAN: 4 };

  this.object = object;
  this.domElement = domElement;
  this.domElement.style.touchAction = 'none'; // disable touch scroll

  // API

  this.enabled = true;

  this.screen = { left: 0, top: 0, width: 0, height: 0 };

  this.rotateSpeed = 1.0;
  this.zoomSpeed = 1.2;
  this.panSpeed = 0.3;

  this.noRotate = false;
  this.noZoom = false;
  this.noPan = false;

  this.staticMoving = false;
  this.dynamicDampingFactor = 0.2;

  this.minDistance = 0;
  this.maxDistance = Infinity;

  this.keys = [ 'KeyA' /*A*/, 'KeyS' /*S*/, 'KeyD' /*D*/ ];

  this.mouseButtons = { LEFT: MOUSE.ROTATE, MIDDLE: MOUSE.DOLLY, RIGHT: MOUSE.PAN };

  // internals

  this.target = new Vector3();

  const EPS = 0.000001;

  const lastPosition = new Vector3();
  let lastZoom = 1;

  let _state = STATE.NONE,
    _keyState = STATE.NONE,

    _touchZoomDistanceStart = 0,
    _touchZoomDistanceEnd = 0,

    _lastAngle = 0;

  const _eye = new Vector3(),

    _movePrev = new Vector2(),
    _moveCurr = new Vector2(),

    _lastAxis = new Vector3(),

    _zoomStart = new Vector2(),
    _zoomEnd = new Vector2(),

    _panStart = new Vector2(),
    _panEnd = new Vector2(),

    _pointers = [],
    _pointerPositions = {};

  // for reset

  this.target0 = this.target.clone();
  this.position0 = this.object.position.clone();
  this.up0 = this.object.up.clone();
  this.zoom0 = this.object.zoom;

  // methods

  this.handleResize = function () {

    const box = scope.domElement.getBoundingClientRect();
    // adjustments come from similar code in the jquery offset() function
    const d = scope.domElement.ownerDocument.documentElement;
    scope.screen.left = box.left + window.pageXOffset - d.clientLeft;
    scope.screen.top = box.top + window.pageYOffset - d.clientTop;
    scope.screen.width = box.width;
    scope.screen.height = box.height;

  };

  const getMouseOnScreen = ( function () {

    const vector = new Vector2();

    return function getMouseOnScreen( pageX, pageY ) {

      vector.set(
        ( pageX - scope.screen.left ) / scope.screen.width,
        ( pageY - scope.screen.top ) / scope.screen.height
      );

      return vector;

    };

  }() );

  const getMouseOnCircle = ( function () {

    const vector = new Vector2();

    return function getMouseOnCircle( pageX, pageY ) {

      vector.set(
        ( ( pageX - scope.screen.width * 0.5 - scope.screen.left ) / ( scope.screen.width * 0.5 ) ),
        ( ( scope.screen.height + 2 * ( scope.screen.top - pageY ) ) / scope.screen.width ) // screen.width intentional
      );

      return vector;

    };

  }() );

  this.rotateCamera = ( function () {

    const axis = new Vector3(),
      quaternion = new Quaternion(),
      eyeDirection = new Vector3(),
      objectUpDirection = new Vector3(),
      objectSidewaysDirection = new Vector3(),
      moveDirection = new Vector3();

    return function rotateCamera() {

      moveDirection.set( _moveCurr.x - _movePrev.x, _moveCurr.y - _movePrev.y, 0 );
      let angle = moveDirection.length();

      if ( angle ) {

        _eye.copy( scope.object.position ).sub( scope.target );

        eyeDirection.copy( _eye ).normalize();
        objectUpDirection.copy( scope.object.up ).normalize();
        objectSidewaysDirection.crossVectors( objectUpDirection, eyeDirection ).normalize();

        objectUpDirection.setLength( _moveCurr.y - _movePrev.y );
        objectSidewaysDirection.setLength( _moveCurr.x - _movePrev.x );

        moveDirection.copy( objectUpDirection.add( objectSidewaysDirection ) );

        axis.crossVectors( moveDirection, _eye ).normalize();

        angle *= scope.rotateSpeed;
        quaternion.setFromAxisAngle( axis, angle );

        _eye.applyQuaternion( quaternion );
        scope.object.up.applyQuaternion( quaternion );

        _lastAxis.copy( axis );
        _lastAngle = angle;

      } else if ( ! scope.staticMoving && _lastAngle ) {

        _lastAngle *= Math.sqrt( 1.0 - scope.dynamicDampingFactor );
        _eye.copy( scope.object.position ).sub( scope.target );
        quaternion.setFromAxisAngle( _lastAxis, _lastAngle );
        _eye.applyQuaternion( quaternion );
        scope.object.up.applyQuaternion( quaternion );

      }

      _movePrev.copy( _moveCurr );

    };

  }() );


  this.zoomCamera = function () {

    let factor;

    if ( _state === STATE.TOUCH_ZOOM_PAN ) {

      factor = _touchZoomDistanceStart / _touchZoomDistanceEnd;
      _touchZoomDistanceStart = _touchZoomDistanceEnd;

      if ( scope.object.isPerspectiveCamera ) {

        _eye.multiplyScalar( factor );

      } else if ( scope.object.isOrthographicCamera ) {

        scope.object.zoom /= factor;
        scope.object.updateProjectionMatrix();

      } else {

        console.warn( 'THREE.TrackballControls: Unsupported camera type' );

      }

    } else {

      factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * scope.zoomSpeed;

      if ( factor !== 1.0 && factor > 0.0 ) {

        if ( scope.object.isPerspectiveCamera ) {

          _eye.multiplyScalar( factor );

        } else if ( scope.object.isOrthographicCamera ) {

          scope.object.zoom /= factor;
          scope.object.updateProjectionMatrix();

        } else {

          console.warn( 'THREE.TrackballControls: Unsupported camera type' );

        }

      }

      if ( scope.staticMoving ) {

        _zoomStart.copy( _zoomEnd );

      } else {

        _zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor;

      }

    }

  };

  this.panCamera = ( function () {

    const mouseChange = new Vector2(),
      objectUp = new Vector3(),
      pan = new Vector3();

    return function panCamera() {

      mouseChange.copy( _panEnd ).sub( _panStart );

      if ( mouseChange.lengthSq() ) {

        if ( scope.object.isOrthographicCamera ) {

          const scale_x = ( scope.object.right - scope.object.left ) / scope.object.zoom / scope.domElement.clientWidth;
          const scale_y = ( scope.object.top - scope.object.bottom ) / scope.object.zoom / scope.domElement.clientWidth;

          mouseChange.x *= scale_x;
          mouseChange.y *= scale_y;

        }

        mouseChange.multiplyScalar( _eye.length() * scope.panSpeed );

        pan.copy( _eye ).cross( scope.object.up ).setLength( mouseChange.x );
        pan.add( objectUp.copy( scope.object.up ).setLength( mouseChange.y ) );

        scope.object.position.add( pan );
        scope.target.add( pan );

        if ( scope.staticMoving ) {

          _panStart.copy( _panEnd );

        } else {

          _panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( scope.dynamicDampingFactor ) );

        }

      }

    };

  }() );

  this.checkDistances = function () {

    if ( ! scope.noZoom || ! scope.noPan ) {

      if ( _eye.lengthSq() > scope.maxDistance * scope.maxDistance ) {

        scope.object.position.addVectors( scope.target, _eye.setLength( scope.maxDistance ) );
        _zoomStart.copy( _zoomEnd );

      }

      if ( _eye.lengthSq() < scope.minDistance * scope.minDistance ) {

        scope.object.position.addVectors( scope.target, _eye.setLength( scope.minDistance ) );
        _zoomStart.copy( _zoomEnd );

      }

    }

  };

  this.update = function () {

    _eye.subVectors( scope.object.position, scope.target );

    if ( ! scope.noRotate ) {

      scope.rotateCamera();

    }

    if ( ! scope.noZoom ) {

      scope.zoomCamera();

    }

    if ( ! scope.noPan ) {

      scope.panCamera();

    }

    scope.object.position.addVectors( scope.target, _eye );

    if ( scope.object.isPerspectiveCamera ) {

      scope.checkDistances();

      scope.object.lookAt( scope.target );

      if ( lastPosition.distanceToSquared( scope.object.position ) > EPS ) {

        scope.dispatchEvent( _changeEvent );

        lastPosition.copy( scope.object.position );

      }

    } else if ( scope.object.isOrthographicCamera ) {

      scope.object.lookAt( scope.target );

      if ( lastPosition.distanceToSquared( scope.object.position ) > EPS || lastZoom !== scope.object.zoom ) {

        scope.dispatchEvent( _changeEvent );

        lastPosition.copy( scope.object.position );
        lastZoom = scope.object.zoom;

      }

    } else {

      console.warn( 'THREE.TrackballControls: Unsupported camera type' );

    }

  };

  this.reset = function () {

    _state = STATE.NONE;
    _keyState = STATE.NONE;

    scope.target.copy( scope.target0 );
    scope.object.position.copy( scope.position0 );
    scope.object.up.copy( scope.up0 );
    scope.object.zoom = scope.zoom0;

    scope.object.updateProjectionMatrix();

    _eye.subVectors( scope.object.position, scope.target );

    scope.object.lookAt( scope.target );

    scope.dispatchEvent( _changeEvent );

    lastPosition.copy( scope.object.position );
    lastZoom = scope.object.zoom;

  };

  // listeners

  function onPointerDown( event ) {

    if ( scope.enabled === false ) return;

    if ( _pointers.length === 0 ) {

      scope.domElement.setPointerCapture( event.pointerId );

      scope.domElement.addEventListener( 'pointermove', onPointerMove );
      scope.domElement.addEventListener( 'pointerup', onPointerUp );

    }

    //

    addPointer( event );

    if ( event.pointerType === 'touch' ) {

      onTouchStart( event );

    } else {

      onMouseDown( event );

    }

  }

  function onPointerMove( event ) {

    if ( scope.enabled === false ) return;

    if ( event.pointerType === 'touch' ) {

      onTouchMove( event );

    } else {

      onMouseMove( event );

    }

  }

  function onPointerUp( event ) {

    if ( scope.enabled === false ) return;

    if ( event.pointerType === 'touch' ) {

      onTouchEnd( event );

    } else {

      onMouseUp();

    }

    //

    removePointer( event );

    if ( _pointers.length === 0 ) {

      scope.domElement.releasePointerCapture( event.pointerId );

      scope.domElement.removeEventListener( 'pointermove', onPointerMove );
      scope.domElement.removeEventListener( 'pointerup', onPointerUp );

    }


  }

  function onPointerCancel( event ) {

    removePointer( event );

  }

  function keydown( event ) {

    if ( scope.enabled === false ) return;

    window.removeEventListener( 'keydown', keydown );

    if ( _keyState !== STATE.NONE ) {

      return;

    } else if ( event.code === scope.keys[ STATE.ROTATE ] && ! scope.noRotate ) {

      _keyState = STATE.ROTATE;

    } else if ( event.code === scope.keys[ STATE.ZOOM ] && ! scope.noZoom ) {

      _keyState = STATE.ZOOM;

    } else if ( event.code === scope.keys[ STATE.PAN ] && ! scope.noPan ) {

      _keyState = STATE.PAN;

    }

  }

  function keyup() {

    if ( scope.enabled === false ) return;

    _keyState = STATE.NONE;

    window.addEventListener( 'keydown', keydown );

  }

  function onMouseDown( event ) {

    if ( _state === STATE.NONE ) {

      switch ( event.button ) {

        case scope.mouseButtons.LEFT:
          _state = STATE.ROTATE;
          break;

        case scope.mouseButtons.MIDDLE:
          _state = STATE.ZOOM;
          break;

        case scope.mouseButtons.RIGHT:
          _state = STATE.PAN;
          break;

      }

    }

    const state = ( _keyState !== STATE.NONE ) ? _keyState : _state;

    if ( state === STATE.ROTATE && ! scope.noRotate ) {

      _moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
      _movePrev.copy( _moveCurr );

    } else if ( state === STATE.ZOOM && ! scope.noZoom ) {

      _zoomStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
      _zoomEnd.copy( _zoomStart );

    } else if ( state === STATE.PAN && ! scope.noPan ) {

      _panStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
      _panEnd.copy( _panStart );

    }

    scope.dispatchEvent( _startEvent );

  }

  function onMouseMove( event ) {

    const state = ( _keyState !== STATE.NONE ) ? _keyState : _state;

    if ( state === STATE.ROTATE && ! scope.noRotate ) {

      _movePrev.copy( _moveCurr );
      _moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );

    } else if ( state === STATE.ZOOM && ! scope.noZoom ) {

      _zoomEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );

    } else if ( state === STATE.PAN && ! scope.noPan ) {

      _panEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );

    }

  }

  function onMouseUp() {

    _state = STATE.NONE;

    scope.dispatchEvent( _endEvent );

  }

  function onMouseWheel( event ) {

    if ( scope.enabled === false ) return;

    if ( scope.noZoom === true ) return;

    event.preventDefault();

    switch ( event.deltaMode ) {

      case 2:
        // Zoom in pages
        _zoomStart.y -= event.deltaY * 0.025;
        break;

      case 1:
        // Zoom in lines
        _zoomStart.y -= event.deltaY * 0.01;
        break;

      default:
        // undefined, 0, assume pixels
        _zoomStart.y -= event.deltaY * 0.00025;
        break;

    }

    scope.dispatchEvent( _startEvent );
    scope.dispatchEvent( _endEvent );

  }

  function onTouchStart( event ) {

    trackPointer( event );

    switch ( _pointers.length ) {

      case 1:
        _state = STATE.TOUCH_ROTATE;
        _moveCurr.copy( getMouseOnCircle( _pointers[ 0 ].pageX, _pointers[ 0 ].pageY ) );
        _movePrev.copy( _moveCurr );
        break;

      default: // 2 or more
        _state = STATE.TOUCH_ZOOM_PAN;
        const dx = _pointers[ 0 ].pageX - _pointers[ 1 ].pageX;
        const dy = _pointers[ 0 ].pageY - _pointers[ 1 ].pageY;
        _touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy );

        const x = ( _pointers[ 0 ].pageX + _pointers[ 1 ].pageX ) / 2;
        const y = ( _pointers[ 0 ].pageY + _pointers[ 1 ].pageY ) / 2;
        _panStart.copy( getMouseOnScreen( x, y ) );
        _panEnd.copy( _panStart );
        break;

    }

    scope.dispatchEvent( _startEvent );

  }

  function onTouchMove( event ) {

    trackPointer( event );

    switch ( _pointers.length ) {

      case 1:
        _movePrev.copy( _moveCurr );
        _moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
        break;

      default: // 2 or more

        const position = getSecondPointerPosition( event );

        const dx = event.pageX - position.x;
        const dy = event.pageY - position.y;
        _touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy );

        const x = ( event.pageX + position.x ) / 2;
        const y = ( event.pageY + position.y ) / 2;
        _panEnd.copy( getMouseOnScreen( x, y ) );
        break;

    }

  }

  function onTouchEnd( event ) {

    switch ( _pointers.length ) {

      case 0:
        _state = STATE.NONE;
        break;

      case 1:
        _state = STATE.TOUCH_ROTATE;
        _moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
        _movePrev.copy( _moveCurr );
        break;

      case 2:
        _state = STATE.TOUCH_ZOOM_PAN;

        for ( let i = 0; i < _pointers.length; i ++ ) {

          if ( _pointers[ i ].pointerId !== event.pointerId ) {

            const position = _pointerPositions[ _pointers[ i ].pointerId ];
            _moveCurr.copy( getMouseOnCircle( position.x, position.y ) );
            _movePrev.copy( _moveCurr );
            break;

          }

        }

        break;

    }

    scope.dispatchEvent( _endEvent );

  }

  function contextmenu( event ) {

    if ( scope.enabled === false ) return;

    event.preventDefault();

  }

  function addPointer( event ) {

    _pointers.push( event );

  }

  function removePointer( event ) {

    delete _pointerPositions[ event.pointerId ];

    for ( let i = 0; i < _pointers.length; i ++ ) {

      if ( _pointers[ i ].pointerId == event.pointerId ) {

        _pointers.splice( i, 1 );
        return;

      }

    }

  }

  function trackPointer( event ) {

    let position = _pointerPositions[ event.pointerId ];

    if ( position === undefined ) {

      position = new Vector2();
      _pointerPositions[ event.pointerId ] = position;

    }

    position.set( event.pageX, event.pageY );

  }

  function getSecondPointerPosition( event ) {

    const pointer = ( event.pointerId === _pointers[ 0 ].pointerId ) ? _pointers[ 1 ] : _pointers[ 0 ];

    return _pointerPositions[ pointer.pointerId ];

  }

  this.dispose = function () {

    scope.domElement.removeEventListener( 'contextmenu', contextmenu );

    scope.domElement.removeEventListener( 'pointerdown', onPointerDown );
    scope.domElement.removeEventListener( 'pointercancel', onPointerCancel );
    scope.domElement.removeEventListener( 'wheel', onMouseWheel );

    scope.domElement.removeEventListener( 'pointermove', onPointerMove );
    scope.domElement.removeEventListener( 'pointerup', onPointerUp );

    window.removeEventListener( 'keydown', keydown );
    window.removeEventListener( 'keyup', keyup );

  };

  this.domElement.addEventListener( 'contextmenu', contextmenu );

  this.domElement.addEventListener( 'pointerdown', onPointerDown );
  this.domElement.addEventListener( 'pointercancel', onPointerCancel );
  this.domElement.addEventListener( 'wheel', onMouseWheel, { passive: false } );


  window.addEventListener( 'keydown', keydown );
  window.addEventListener( 'keyup', keyup );

  this.handleResize();

  // force an update at start
  this.update();

}

}

export { TrackballControls };
